Multiplexing allows a single SSH connection to be shared by multiple sessions. The connection could be set to persist for a set time and then reused for fast reconnection to the server.

Sharing SSH sessions in a single connection via multiplexing could be configured in the user's SSH client configuration file.

Steps to share and reuse SSH connection via multiplexing:

  1. Launch terminal.
  2. Open SSH client configuration file for your user using your preferred text editor.

    $ vi ~/.ssh/config

  3. Select the host(s) that you want to implement multiplexing.

    host *

    * applies configuration for all hosts. Other possible host options: * 192.168.100.*

  4. Enable multiplexing for the selected host(s).

    host *     controlmaster auto

  5. Set how long do you want the multiplexing session to persist.

    host *     controlmaster auto     controlpersist 10m

  6. Set path and filename for controlmaster file.

    host *     controlmaster auto     controlpersist 10m     controlpath ~/.ssh/muxmasters/%C

    Create folder if doesn't exist.

    $ mkdir -p ~/.ssh/muxmasters

  7. Check for existing control file on local host.

    $ ls ~/.ssh/muxmasters

  8. Log in to a remote host.

    $ ssh -- hostname [email protected]'s password:  remotehost

  9. Check for created control file to confirm.

    $ ls ~/.ssh/muxmasters 598a7155ff90f076057fb265730c6ffe5997d4bb

  10. Log in again to the same host to test.

    $ ssh -- hostname host

    Should be without password and very fast as long as you log in again within the controlpersist time value.